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DISSERTATION EXTRINSIC AND INTRINSIC DRIVERS OF FELINE IMMUNODEFICIENCY VIRUS EVOLUTION IN THE MOUNTAIN LION Submitted by Jennifer L. Malmberg Department of Microbiology, Immunology, and Pathology In partial fulfillment of the requirements For the Degree of Doctor of Philosophy Colorado State University Fort Collins, Colorado Fall 2018 Doctoral Committee: Advisor: Sue VandeWoude Kevin Crooks Sandra Quackenbush Rushika Perera Copyright by Jennifer Malmberg 2018 All Rights Reserved ABSTRACT EXTRINSIC AND INTRINSIC DRIVERS OF FELINE IMMUNODEFICIENCY VIRUS EVOLUTION IN THE MOUNTAIN LION Viruses are among the most rapidly evolving entities in biology and are so intricately associated with their obligate hosts that the boundary between host and pathogen, and thus the study of one versus the other, is blurred by intimate interactions at scales ranging from proteins to populations. Viral genetic variation is both ecologically and molecularly determined, and thus viruses serve as measurably evolving populations that provide a window into adaptations and behaviors of their vertebrate hosts. Of all viral families, the biology of retroviruses is coupled especially tightly to that of the host due to permanent integration of viral DNA into eukaryotic chromosomes, producing an inherently dynamic infection that persists for life. Feline immunodeficiency virus (FIV) is among the oldest of viruses in the Lentivirus genus and the mountain lion, also known as the puma (Puma concolor), is the most extensively ranging New World terrestrial mammal. We used molecular analyses to investigate the host-pathogen interactions between pumas and FIV across geographic and temporal space, within and across populations, and among FIV subtypes. In Chapter One, we investigate cross-species transmission of FIV from bobcats to pumas and compare the outcome of spillover infections in two populations separated by vast geographic space. Our findings reveal that the puma is typically a dead-end host of bobcat FIV infection, although altered population dynamics can promote stuttering chains of infection following spillover events. In Chapter Two, we employed a novel next generation sequencing technique to ii investigate the impact of management interactions such as population supplementation on FIV dynamics in the endangered Florida panther. Results from this chapter show evidence for cointroduction of one subtype of FIV with translocated pumas from Texas, followed by local extinction of the previously circulating, ‘less fit’ subtype in the puma host. Chapter Three describes an important intrinsic driver of viral evolution through characterization of the APOBEC3 protein A3Z3 in the puma, a primary cellular restriction factor against FIV. We show evidence that at least one geographically associated genotype of puma FIV is able to evade lethal hypermutation typical of A3Z3 activity despite a deficiency in the viral counter protein Vif. The collective findings of this work explore the ancient relationship between a vastly ranging apex predator and a chronic lentiviral infection by applying both novel and conventional methodologies to a unique, naturally occurring host-pathogen system. Although our questions were specific to FIV in pumas, the methodologies described here can be applied to other systems and models to address inherent limitations of opportunistic field studies including DNA degradation and sequencing of low copy number templates from archival biological samples. Ancient viral infections have the potential to elucidate the life history of mammalian hosts, which is particularly useful in the study of elusive and broadly ranging carnivores threatened by urbanization and habitat fragmentation. Future objectives of this work will expand analyses to incorporate additional populations, such as the modern Texas puma, and more thoroughly investigate genotype variation in Vif-A3Z3 interactions. Collectively, our results will inform additional studies that seek to elucidate determinants of host-pathogen interactions in naturally- occurring systems across diverse ecosystems and broad spatiotemporal scales. iii ACKNOWLEDGEMENTS This dissertation represents the collective effort of many interdisciplinary scientists and was made possible by a support network of extraordinary friends and family. Thank you to all members of the Sue VandeWoude Research Group for making this experience rich, challenging, and full of fun. I am especially grateful to have learned from Dr. Sue VandeWoude, who has taught me so much more than simple science and has inspired me to set the bar high. Special thanks to Justin Lee, for paving the way for the interesting questions investigated herein, for supporting me even when I was stubborn, and for generous contributions to this work. Thank you to Erick Gagne, for understated contributions to this work, for your contagious enthusiasm for science, and for humbly helping me through the lab and life. Thanks also to Elliott Chui for priceless adventures in and out of the lab and for the type of friendship that is a rarity in life. Thank you to Craig Miller, for all the years we weathered the storm together, for keeping it real, and for teaching me how to navigate the juggling act of the combined program. And thank you to Simona Kraberger, for your leadership, support, and friendship. Last but not least, thanks to Mary Nehring, Carmen Ledesma, and Sarah Kechejian – it has truly been a pleasure working with each of you. Outside of the VandeWoude Research Group, I would like to thank Dr. Kevin Crooks, Dr. Ed Hoover, Dr. Gary Mason, Dr. Chris Funk, Dr. Holly Ernest, Dr. Sandra Quackenbush, and Dr. Rushika Perera for support of my academic endeavors. I am grateful for the support of the America College of Veterinary Pathologists/Society of Toxicologic Pathology (ACVP/STP) Coalition for Veterinary Pathology Fellows and the late Dr. Linda Munson for providing funding throughout my PhD and supporting my passion for wildlife health. I feel honored and fortunate iv to have completed my PhD under the Linda Munson Fellowship for Wildlife Pathology Research. I would also like to thank Kelly Hughes, Emily Rout, Rebecca Much, Hannah Riedl, Emily Warner, Monica Brackney, Greta Krafsur, Elizabeth Sagen, Laura Backus, and Julie Grawe for inspiration and unrelenting personal and professional support. Although I no longer see all of you regularly, you each supported me and energized me at various stages, impacting my career and life in important and sustaining ways. Thank you to my parents, who gave me perspective and told me I could be whoever I wanted to be (and so I will). And to my sisters, who have filled the years with fun and have unknowingly pushed me to do more and be more. And thank you, most of all, to my husband Sam. You are the source of my ambition, beginning to end. Each of the following chapters was supported by a unique group of scientists with whom I am grateful to have worked. Thank you for your contributions throughout this process. Chapter One: Justin Lee, Britta Wood, Sahaja Hladky, Ryan Troyer, Melody Roelke, Mark Cunningham, Roy McBride, Erin Boydston, Laurel Serieys, Seth Riley, Winston Vickers, Walter Boyce, Kevin Crooks, and Sue VandeWoude. Chapter Two: Justin Lee, Erick Gagne, Simona Kraberger, Sarah Kechejian, Melody Roelke, Mark Cunningham, Kevin Crooks, and Sue VandeWoude. Chapter Three: Erick Gagne, Simona Kraberger, Ryan Troyer, Dagan Loisel, Owen Slater, Sam Sharpe, Zeli Zhang, Qinyong Gu, Carsten Münk, and Sue VandeWoude. v DEDICATION To Sue, for being the exceptional mentor you are, and the strong female scientist I aspire to be. vi TABLE OF CONTENTS ABSTRACT .................................................................................................................................... ii ACKNOWLEDGEMENTS ........................................................................................................... iv DEDICATION ............................................................................................................................... vi TABLE OF CONTENTS .............................................................................................................. vii INTRODUCTION ...........................................................................................................................1 CHAPTER ONE: Feline immunodeficiency virus cross-species transmission: Implications for emergence of new lentiviral infections ..........................................................................................14 Synopsis .............................................................................................................................14 Importance .........................................................................................................................15 Introduction ........................................................................................................................15 Methods..............................................................................................................................18 Results ................................................................................................................................25 Discussion ..........................................................................................................................27 Figures................................................................................................................................34 Tables .................................................................................................................................39
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